Abstract：
Footwear has the potential to reduce soft-tissue vibrations (STV) but responses are highly subject-specific. Recent evidence shows that compressive garments minimizing STV have a beneficial effect on neuromuscular (NM) fatigue. The aim was to determine whether an individualized midsole hardness can minimize STV and NM fatigue during a half marathon. Twenty experienced runners were recruited for three visits: a familiarization session including the identification of midsole minimizing and maximizing STV amplitude (MIN and MAX, respectively), and two half marathon sessions at 95% of speed at the second ventilatory threshold. STV of the gastrocnemius medialis (GM) muscle, running kinetics, foot strike pattern, rating perceived exhaustion (RPE), and midsole liking were recorded every 3 km. NM fatigue was assessed on plantar flexors (PF) before (PRE) and after (POST) the half marathon. At POST, PF central and peripheral alterations and changes in contact time, step frequency, STV median frequency, and impact force frequency as well as foot strike pattern were found in both MIN and MAX. No significant differences in damping, STV main frequency, flight time, duty factor, and loading rate were observed between conditions whatever the time period. During the half marathon, STV amplitude of GM significantly increased over time for the MAX condition (+13.3%) only. Differences between MIN and MAX were identified for RPE and midsole liking. It could be hypothesized that, while significant, the effect of midsole hardness on STV is too low to substantially affect NM fatigue.
摘要：
鞋类具有减少软组织振动（STV）的潜力，但反应是高度特定于受试者的。最近的证据表明,使STV最小化的压缩服装对神经肌肉(NM)疲劳具有有益效果。目的是确定个性化的中底硬度是否可以在半程马拉松期间最大程度地减少STV和NM疲劳。招募了20名经验丰富的跑步者进行了3次访问：熟悉会议，包括识别中底最小化和最大化STV幅度（MIN和MAX，分别)，在第二通气阈值下以95%的速度进行两次半程马拉松。腓肠肌中肌（GM）的STV，运行动力学，脚部撞击模式,对感知疲惫(RPE)进行评级，每3公里记录一次中底喜好。在半程马拉松之前（PRE）和之后（POST）在足底屈肌（PF）上评估NM疲劳。在POST,PF中枢和外周改变和接触时间的变化，步进频率,STV中值频率,在MIN和MAX中都发现了冲击力频率和脚击模式。阻尼没有显著差异，STV主频率，飞行时间,占空比,和加载速率在任何时间段的条件之间观察。在半程马拉松比赛中，仅对于MAX条件(+13.3%),GM的STV振幅随时间显著增加。MIN和MAX之间的差异被确定为RPE和中底喜好。可以假设，虽然意义重大，鞋底夹层硬度对STV的影响太低而不能显著影响NM疲劳。
